Telescopic joint for shafting, &amp;c.



PATENTED MAR. s, 1904.

E. G. HOFFMANN.

TELESOOPIC JOINT FOR SHAPTING, &o.

v APPLIUATION FILED 0013.6, 1903.

N0 MODEL.

W/T/VE-SSES.

' cation.

9 stop 10, Figs. 1 and 5, is further provided in crating the parts witha minimum of friction.

' UNITED \STATES Fatented March 8, 1904.

PATENT O FI Y ERNST GUSTAV HOFFMANN, or LONDON, ENGLAN TELESCOPIC com-rFOR SHAFTING, &o.

JSPECIFICATION forming part of Letters latent No. 754,066, dated March8,1904.

Application filed October 5, 1903.

To all whom, it may concern:

Be it known that I, ERNST GUSTAV HOFF- MANN, a subject of His Majestythe German Emperor, residing at London, England, have invented a certainnew and useful Improvement in Telescopic Joints for Shafting and theLike, of which the following is a specifi- This invention relates totelescopic joints for connecting shafting and the like, with the purposeof allowing a variation in the length of the connected parts, the objectin view being the formation of a telescopic joint in which ball-bearingsmay be used with a view to op- In the accompanying drawings, Figure 1 isa half-sectional elevation of a telescopic joint constructed inaccordance with my invention. Fig. 2 is a transverse sectiontherethrough, on line a b of Fig. 1, looking in the direction of thearrows. Fig. 3 is a longitudinal section through the cage for theball-bearings, shown separately. Fig; 4 is a transverse sectiontherethrough, and Fig. 5 is a transverse section through the joint online 0 d of Fig. l in the direction of the arrows.

The joint comprises an outer shaft 1, so called by reason of itscarrying a socket 2 in its end for the reception of the end of the innershaft 3. Said inner shaft carries a seriesof grooves 4 upon its surface,preferably approximately V-shaped, which correspond with a series ofsimilar grooves 5, formed on the interior surface of the socket 2 or ofa sleeve 6, situate in the socket 2 of the outer shaft 1 and carriedthereby. Said sleeve if employed is preferably secured in the socket bya key 14, as shown in Fig. 2.

The two shaftsl and 3 are connected by a series of balls 7 in each oftheseries of grooves 4: and- 5, which balls are carried by a cage 8; sothat they maintain their correct distance apart. The cage 8 is providedon its exterior with a spring 9 or similar device, pressing on theinterior surface of the sleeve, as shown,- v(or said spring may be inthe inside of said cage and press on the shaft 3,) to stop chatteringand to prevent displacement of the said cage by concussion or from othercauses.

movement of the two shafts with respect to a series of internallongitudinal grooves, an

Serial No. 175,786. (No model.)

the interior of the sleeve to limit the longitudinal movement in onedirection of the cage and balls when one of the shafts ismovedlongitudinally, and movement in the opposite direction is similarlylimited by a second-stop 11, carried bya cover 12, which cover may bescrewed into the socket and form a close fit over the inner shaft, whichit embraces, and be provided on the face adjacent to said shaft with agroove 13, adapted to receive a felt or other washer, so that dust iseffectually excluded from the interior of the sleeve 6.

The stop 10 is shown as an internal flange in the socket 2, such flangehaving parts projecting into the line of travel of the cage, but 5 itmay be formed as a projection inside the socket of any suitable kind.

It will be seen that in "operation the balls allow of a practicallyfrictionless longitudinal each other, and also form the necessarycoupling between the twofor taking the torsional strain and acting as asliding bearing.

What I claim is h 1. In a telescopic olnt, and in combination tween theinner member and socket.

2. In a telescopic joint, and in combination a socket forming one of themembers, a sleeve I carried by said socket carryinga series of internallongitudinal grooves, an inner member carrying a corresponding series ofexternal grooves, a cage situate between said-inner member and sleeveand a number of balls carried by said cage in each of said grooves,forming sliding bearings between the inner member and the sleeve.

3. In a telescopic joint, and in combination, a socket forming one ofthe members carrying innenmember carrying a corresponding series ofexternal grooves, a cage situate between the inner member and thesocket, balls carried by said cage in each of said grooves, and means 1a socket forming one of the members having for limiting the longitudinalmovement of the cage and balls in either direction.

4. In a telescopic joint, and in combination,

a socket forming one of the members carrying 5 a series of internallongitudinal grooves an inner member carrying a corresponding series ofexternal grooves, a cage situated between the inner member and thesocket, balls carried by said cage in each of said grooves, and a IO capcarried by said socket and encircling the said inner member and forminga dust-excluding cover for the inner parts.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing Witnesses.

ERNST GUSTAV H OFFMANN.

Witnesses:

ALLEN PARRY J ONES, A. KNIGHT CROAD.

